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eM Client vs Kontact: catalog facts
eM Client	Kontact
Freemium Free licence for personal, non-commercial use with up to two accounts; Personal from…	Free Free and open source, developed by the KDE community.
Windows, macOS, Android, iOS	Linux
Handles Gmail, Microsoft 365, Outlook, Exchange and plain IMAP without plugins Email, calendar, tasks, contacts, notes and chat in one polished window	Mail, calendar, contacts and feeds in one window Works offline with your data
No Linux version The free licence is capped at two accounts and forbids any commercial use	Best suited to the KDE Plasma desktop Large suite with many settings to learn
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
Account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 20, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.